I answered this in your other post. Bottom line is they are hard to find. One off a USA model will work though. I usally get them off US ebay if they are cheap so thats one place you can find them. if you grab a copy of Just Bikes and spend the arvo ringing every wrecker in the country you might get lucky. i tend to not waste money on second hand PE flywheels from wreckers though. They usally have been stored loose and have lost their magnetism and are half stuffed anyway and most wreckers know they are rare and charge accordingly so thats why i recommend buying brand new, otherwise be prepared to accept the fact that the wrecker will charge you $200 or so for one and when you get it you find the magents are weak and still only produce a pissy spark.
As i said before, practically any stator and flywheel will work off another PE as long as it has the matching stator. 175 and pre 80 250 stators require 2 holes to be drilled in plate to make it work.